Update app.py

app.py

@@ -13,9 +13,8 @@ def main_app():
 
         # === Header Top Bar ===
         with gr.Row(elem_id="top-bar"):
-            gr.Markdown("☰", elem_id="collapse-left")
-            gr.Markdown("🌙", elem_id="dark-toggle")
-
+            collapse_btn = gr.Button("☰", elem_id="collapse-left", variant="secondary")
+            darkmode_btn = gr.Button("🌙", elem_id="dark-toggle", variant="secondary")
 
         with gr.Row():
             # === Sidebar ===